How bacteria use quorum sensing to make light

Many bacteria make light only when enough of them gather

Bacteria can release signaling chemicals into their surroundings. As more bacteria gather, these chemicals build up. Once they reach a certain level, the bacteria can switch on light-making genes together. This system is called quorum sensing.

Persian rulers made gifts into obligations

In the Achaemenid Persian Empire, rulers gave lavish public gifts to favored subjects. The gifts were so valuable that recipients could not repay them with a greater gift, turning generosity into an obligation of loyalty.

A helpful gene can pull nearby genes along with it

When natural selection makes a useful gene variant more common, nearby DNA can become more common too simply because it sits close to that gene on the same chromosome. Even neutral or slightly harmful variants can sometimes be carried along this way.

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How bacteria use quorum sensing to make light

Many bacteria make light only when enough of them gather

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